/*
 * Copyright 2013-2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.rollway.restful.processor;


import com.rollway.restful.MethodMetadata;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestBody;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

import static com.rollway.restful.utils.Util.checkState;

public class RequestBodyParameterProcessor implements AnnotatedParameterProcessor {

	private static final Class<RequestBody> ANNOTATION = RequestBody.class;

	@Override
	public Class<? extends Annotation> getAnnotationType() {
		return ANNOTATION;
	}

	@Override
	public boolean processArgument(AnnotatedParameterContext context, Annotation annotation, Method method) {
		int parameterIndex = context.getParameterIndex();
		MethodMetadata data = context.getMethodMetadata();
		checkState(data.getBodyIndex() == null, "body can only be present once");
		data.setBodyIndex(parameterIndex);
		data.getHeaders().put(HttpHeaders.CONTENT_TYPE,MediaType.APPLICATION_JSON_VALUE);
		return true;
	}

}
